I have a pair of B&W PX (first gen) headphones whose batter has finally bit the dust. These headphones are still great, but they now won’t hold a charge.

I’ve been looking at replacing the battery, and it should be doable based on my research. But the problem I’m facing right now is that I cannot for the life of me find a place to buy this battery that lives in the ear cup. The image attached is from a site detailing how to replace it, but the site just says something like “just buy a new battery” with no links or direction on where to find one.

Looking for any of the numbers on the battery in the image have so far not yielded anything helpful to me since web search now sucks balls because of AI.

So my question is: does anyone know of a good site or utility where I might be able to track down a replacement battery? I’d prefer to not use Amazon since fuck them.

Failing that, does anyone know of a good community here to ask about batteries in general?